LayerRenderJobs QgsMapRendererJob::prepareJobs( QPainter* painter, QgsPalLabeling* labelingEngine )
{
LayerRenderJobs layerJobs;
// render all layers in the stack, starting at the base
QListIterator<QString> li( mSettings.layers() );
li.toBack();
if ( mCache )
{
bool cacheValid = mCache->init( mSettings.visibleExtent(), mSettings.scale() );
QgsDebugMsg( QString( "CACHE VALID: %1" ).arg( cacheValid ) );
Q_UNUSED( cacheValid );
}
mGeometryCaches.clear();
while ( li.hasPrevious() )
{
QString layerId = li.previous();
QgsDebugMsg( "Rendering at layer item " + layerId );
QgsMapLayer *ml = QgsMapLayerRegistry::instance()->mapLayer( layerId );
if ( !ml )
{
mErrors.append( Error( layerId, "Layer not found in registry." ) );
continue;
}
QgsDebugMsg( QString( "layer %1: minscale:%2 maxscale:%3 scaledepvis:%4 extent:%5 blendmode:%6" )
.arg( ml->name() )
.arg( ml->minimumScale() )
.arg( ml->maximumScale() )
.arg( ml->hasScaleBasedVisibility() )
.arg( ml->extent().toString() )
.arg( ml->blendMode() )
);
if ( ml->hasScaleBasedVisibility() && ( mSettings.scale() < ml->minimumScale() || mSettings.scale() > ml->maximumScale() ) ) //|| mOverview )
{
QgsDebugMsg( "Layer not rendered because it is not within the defined visibility scale range" );
continue;
}
QgsRectangle r1 = mSettings.visibleExtent(), r2;
const QgsCoordinateTransform* ct = 0;
if ( mSettings.hasCrsTransformEnabled() )
{
ct = mSettings.layerTransfrom( ml );
if ( ct )
{
reprojectToLayerExtent( ct, ml->crs().geographicFlag(), r1, r2 );
}
QgsDebugMsg( "extent: " + r1.toString() );
if ( !r1.isFinite() || !r2.isFinite() )
{
mErrors.append( Error( layerId, "There was a problem transforming layer's' extent. Layer skipped." ) );
continue;
}
}
// Force render of layers that are being edited
// or if there's a labeling engine that needs the layer to register features
if ( mCache && ml->type() == QgsMapLayer::VectorLayer )
{
QgsVectorLayer* vl = qobject_cast<QgsVectorLayer *>( ml );
if ( vl->isEditable() || ( labelingEngine && labelingEngine->willUseLayer( vl ) ) )
mCache->clearCacheImage( ml->id() );
}
layerJobs.append( LayerRenderJob() );
LayerRenderJob& job = layerJobs.last();
job.cached = false;
job.img = 0;
job.blendMode = ml->blendMode();
job.layerId = ml->id();
job.context = QgsRenderContext::fromMapSettings( mSettings );
job.context.setPainter( painter );
job.context.setLabelingEngine( labelingEngine );
job.context.setCoordinateTransform( ct );
job.context.setExtent( r1 );
// if we can use the cache, let's do it and avoid rendering!
if ( mCache && !mCache->cacheImage( ml->id() ).isNull() )
{
job.cached = true;
job.img = new QImage( mCache->cacheImage( ml->id() ) );
job.renderer = 0;
job.context.setPainter( 0 );
continue;
}
// If we are drawing with an alternative blending mode then we need to render to a separate image
// before compositing this on the map. This effectively flattens the layer and prevents
// blending occuring between objects on the layer
if ( mCache || !painter || needTemporaryImage( ml ) )
{
// Flattened image for drawing when a blending mode is set
QImage * mypFlattenedImage = 0;
mypFlattenedImage = new QImage( mSettings.outputSize().width(),
mSettings.outputSize().height(),
mSettings.outputImageFormat() );
if ( mypFlattenedImage->isNull() )
{
mErrors.append( Error( layerId, "Insufficient memory for image " + QString::number( mSettings.outputSize().width() ) + "x" + QString::number( mSettings.outputSize().height() ) ) );
delete mypFlattenedImage;
layerJobs.removeLast();
continue;
}
mypFlattenedImage->fill( 0 );
job.img = mypFlattenedImage;
QPainter* mypPainter = new QPainter( job.img );
mypPainter->setRenderHint( QPainter::Antialiasing, mSettings.testFlag( QgsMapSettings::Antialiasing ) );
job.context.setPainter( mypPainter );
}
job.renderer = ml->createMapRenderer( job.context );
if ( mRequestedGeomCacheForLayers.contains( ml->id() ) )
{
if ( QgsVectorLayerRenderer* vlr = dynamic_cast<QgsVectorLayerRenderer*>( job.renderer ) )
{
vlr->setGeometryCachePointer( &mGeometryCaches[ ml->id()] );
}
}
} // while (li.hasPrevious())
return layerJobs;
}
LayerRenderJobs QgsMapRendererJob::prepareJobs( QPainter *painter, QgsLabelingEngine *labelingEngine2 )
{
LayerRenderJobs layerJobs;
// render all layers in the stack, starting at the base
QListIterator<QgsMapLayer *> li( mSettings.layers() );
li.toBack();
if ( mCache )
{
bool cacheValid = mCache->init( mSettings.visibleExtent(), mSettings.scale() );
Q_UNUSED( cacheValid );
QgsDebugMsgLevel( QString( "CACHE VALID: %1" ).arg( cacheValid ), 4 );
}
bool requiresLabelRedraw = !( mCache && mCache->hasCacheImage( LABEL_CACHE_ID ) );
while ( li.hasPrevious() )
{
QgsMapLayer *ml = li.previous();
QgsDebugMsgLevel( QString( "layer %1: minscale:%2 maxscale:%3 scaledepvis:%4 blendmode:%5" )
.arg( ml->name() )
.arg( ml->minimumScale() )
.arg( ml->maximumScale() )
.arg( ml->hasScaleBasedVisibility() )
.arg( ml->blendMode() )
, 3 );
if ( !ml->isInScaleRange( mSettings.scale() ) ) //|| mOverview )
{
QgsDebugMsgLevel( "Layer not rendered because it is not within the defined visibility scale range", 3 );
continue;
}
QgsRectangle r1 = mSettings.visibleExtent(), r2;
QgsCoordinateTransform ct;
ct = mSettings.layerTransform( ml );
if ( ct.isValid() )
{
reprojectToLayerExtent( ml, ct, r1, r2 );
}
QgsDebugMsgLevel( "extent: " + r1.toString(), 3 );
if ( !r1.isFinite() || !r2.isFinite() )
{
mErrors.append( Error( ml->id(), tr( "There was a problem transforming the layer's extent. Layer skipped." ) ) );
continue;
}
// Force render of layers that are being edited
// or if there's a labeling engine that needs the layer to register features
if ( mCache && ml->type() == QgsMapLayer::VectorLayer )
{
QgsVectorLayer *vl = qobject_cast<QgsVectorLayer *>( ml );
bool requiresLabeling = false;
requiresLabeling = ( labelingEngine2 && QgsPalLabeling::staticWillUseLayer( vl ) ) && requiresLabelRedraw;
if ( vl->isEditable() || requiresLabeling )
{
mCache->clearCacheImage( ml->id() );
}
}
layerJobs.append( LayerRenderJob() );
LayerRenderJob &job = layerJobs.last();
job.cached = false;
job.img = nullptr;
job.layer = ml;
job.renderingTime = -1;
job.context = QgsRenderContext::fromMapSettings( mSettings );
job.context.expressionContext().appendScope( QgsExpressionContextUtils::layerScope( ml ) );
job.context.setPainter( painter );
job.context.setLabelingEngine( labelingEngine2 );
job.context.setCoordinateTransform( ct );
job.context.setExtent( r1 );
if ( mFeatureFilterProvider )
job.context.setFeatureFilterProvider( mFeatureFilterProvider );
QgsMapLayerStyleOverride styleOverride( ml );
if ( mSettings.layerStyleOverrides().contains( ml->id() ) )
styleOverride.setOverrideStyle( mSettings.layerStyleOverrides().value( ml->id() ) );
job.blendMode = ml->blendMode();
job.opacity = 1.0;
if ( QgsVectorLayer *vl = qobject_cast<QgsVectorLayer *>( ml ) )
{
job.opacity = vl->opacity();
}
// if we can use the cache, let's do it and avoid rendering!
if ( mCache && mCache->hasCacheImage( ml->id() ) )
{
job.cached = true;
job.imageInitialized = true;
job.img = new QImage( mCache->cacheImage( ml->id() ) );
job.renderer = nullptr;
job.context.setPainter( nullptr );
continue;
}
// If we are drawing with an alternative blending mode then we need to render to a separate image
// before compositing this on the map. This effectively flattens the layer and prevents
// blending occurring between objects on the layer
if ( mCache || !painter || needTemporaryImage( ml ) )
{
// Flattened image for drawing when a blending mode is set
QImage *mypFlattenedImage = nullptr;
mypFlattenedImage = new QImage( mSettings.outputSize().width(),
mSettings.outputSize().height(),
mSettings.outputImageFormat() );
if ( mypFlattenedImage->isNull() )
{
mErrors.append( Error( ml->id(), tr( "Insufficient memory for image %1x%2" ).arg( mSettings.outputSize().width() ).arg( mSettings.outputSize().height() ) ) );
delete mypFlattenedImage;
layerJobs.removeLast();
continue;
}
job.img = mypFlattenedImage;
QPainter *mypPainter = new QPainter( job.img );
mypPainter->setRenderHint( QPainter::Antialiasing, mSettings.testFlag( QgsMapSettings::Antialiasing ) );
job.context.setPainter( mypPainter );
}
QTime layerTime;
layerTime.start();
job.renderer = ml->createMapRenderer( job.context );
job.renderingTime = layerTime.elapsed(); // include job preparation time in layer rendering time
} // while (li.hasPrevious())
return layerJobs;
}